4G
Antenna, Communications 4G (or 4-G) is short for fourth-generation, the successor wireless access technology to 3G. It describes two different, but overlapping ideas. The IEEE (Institute of Electrical and Electronics Engineers) official name for 4G is "3G and beyond".

Ideally, 4G would provide users with on demand high quality video and audio. The killer application of 4G is not clear, but video is one of the big differences between 4G and 3G. 4G may use OFDM (Orthogonal Frequency Division Multiplexing), and also OFDMA (Orthogonal Frequency Division Multiple Access) to better allocate network resources to multiple users. 4G devices may use SDR (Software-defined radio) receivers which allows for better use of available bandwidth as well as making use of multiple channels simultaneously.
Information from Wikipedia.org

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